tiox,
Cosmic, Disco and Eoan packages are discontinued by packages.ubuntu.com and no longer available to download.
I recommend using launchpad instead, when it's a very reliable source that will hardly be erased.
https://launchpad.net/ubuntu/+source/pygtk/2.24.0-6
(pick your processor's build)
https://launchpad.net/ubuntu/+source/pygtk/2.24.0-6/+build/16950431
Following your guidance for 'Focal' I downloaded
python-gtk2_2.24.0-6_amd64.deb
python-glade2_2.24.0-6_amd64.deb
and merged with ladspa-eq_amd64.tar.gz
you compiled.
Running a
sudo apt install ./*.deb
on the folder does the job nicely,
and alternatively we can use
sudo dpkg -i *.deb
sudo apt --fix-broken install
So I confirm that adding
sudo add-apt-repository -n ppa:nilarimogard/webupd8
sudo apt-get install pulseaudio-equalizer=2.7.0.2-5~webupd8~xenial0
will finish the installation with
The following NEW packages will be installed:
ladspa-sdk libgsm1 pulseaudio-equalizer python-gi python-gobject swh-plugins
and remain fully operational for 'Focal Fossa' without the need to edit the repository list.
I strongly recommend using
sudo apt-mark hold pulseaudio-equalizer
afterward, to avoid accidentally updating it to Ubuntu's repo bad version.
Sweet, sweet EQ =)
Great work.